Adjustable fracturing head and manifold system

ABSTRACT

An adjustable fracturing system is provided. In one embodiment, the system includes a fracturing manifold coupled to a fracturing tree having a fracturing head. The fracturing head includes an adjustable body that enables variation of a dimension of the body and facilitates connection of the fracturing manifold to the fracturing tree. Additional systems, devices, and methods are also disclosed.

BACKGROUND

This section is intended to introduce the reader to various aspects ofart that may be related to various aspects of the presently describedembodiments. This discussion is believed to be helpful in providing thereader with background information to facilitate a better understandingof the various aspects of the present embodiments. Accordingly, itshould be understood that these statements are to be read in this light,and not as admissions of prior art.

In order to meet consumer and industrial demand for natural resources,companies often invest significant amounts of time and money insearching for and extracting oil, natural gas, and other subterraneanresources from the earth. Particularly, once a desired subterraneanresource is discovered, drilling and production systems are oftenemployed to access and extract the resource. These systems may belocated onshore or offshore depending on the location of a desiredresource. Further, such systems generally include a wellhead assemblythrough which the resource is extracted. These wellhead assemblies mayinclude a wide variety of components, such as various casings, valves,fluid conduits, and the like, that control drilling or extractionoperations.

Additionally, such wellhead assemblies may use a fracturing tree andother components to facilitate a fracturing process and enhanceproduction from a well. As will be appreciated, resources such as oiland natural gas are generally extracted from fissures or other cavitiesformed in various subterranean rock formations or strata. To facilitateextraction of such resources, a well may be subjected to a fracturingprocess that creates one or more man-made fractures in a rock formation.This facilitates, for example, coupling of pre-existing fissures andcavities, allowing oil, gas, or the like to flow into the wellbore. Suchfracturing processes typically include injecting a fracturingfluid—which is often a mixture including sand and water—into the well toincrease the well's pressure and form the man-made fractures. Afracturing manifold may provide fracturing fluid to one or morefracturing trees via fracturing lines (e.g., pipes). But the fracturingmanifolds and associated fracturing tress are typically large and heavy,and may be mounted to other equipment at a fixed location, makingadjustments between the fracturing manifold and a fracturing treedifficult.

SUMMARY

Certain aspects of some embodiments disclosed herein are set forthbelow. It should be understood that these aspects are presented merelyto provide the reader with a brief summary of certain forms theinvention might take and that these aspects are not intended to limitthe scope of the invention. Indeed, the invention may encompass avariety of aspects that may not be set forth below.

Embodiments of the present disclosure generally relate to adjustablefracturing systems that facilitate alignment and coupling of afracturing manifold with a fracturing tree via a fluid connection. Inone embodiment, a fracturing system includes one or more adjustmentjoints that each provide at least one degree of freedom in aligning afluid connection with a fracturing manifold and a fracturing tree. Theadjustment joints may be provided in the form of fracturing heads or insome other form, such as pipe connectors. More specifically, anadjustment joint in the fracturing system may include a dimension thatmay be varied by a user to facilitate connection of the fracturingmanifold and the fracturing tree in an efficient manner (e.g., byallowing the user to compensate for unexpected alignment issues duringconnection).

Various refinements of the features noted above may exist in relation tovarious aspects of the present embodiments. Further features may also beincorporated in these various aspects as well. These refinements andadditional features may exist individually or in any combination. Forinstance, various features discussed below in relation to one or more ofthe illustrated embodiments may be incorporated into any of theabove-described aspects of the present disclosure alone or in anycombination. Again, the brief summary presented above is intended onlyto familiarize the reader with certain aspects and contexts of the someembodiments without limitation to the claimed subject matter.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of certain embodimentswill become better understood when the following detailed description isread with reference to the accompanying drawings in which likecharacters represent like parts throughout the drawings, wherein:

FIG. 1 generally depicts an adjustable fracturing system in accordancewith an embodiment of the present disclosure;

FIG. 2 is a diagram of the adjustable fracturing system of FIG. 1 with afracturing manifold coupled to multiple fracturing trees in accordancewith an embodiment of the present disclosure;

FIG. 3 is a perspective view of certain components of the adjustablefracturing system, including the fracturing manifold, one fracturingtree, and several adjustment joints in accordance with an embodiment ofthe present disclosure;

FIG. 4 is a perspective view of an adjustment joint in the form of afracturing head in accordance with an embodiment of the presentdisclosure;

FIG. 5 is a cross-section of the fracturing head of FIG. 4 in accordancewith an embodiment of the present disclosure;

FIG. 6 generally depicts the fracturing head of FIGS. 4 and 5 followingadjustment of the fracturing head to increase its length in accordancewith an embodiment of the present disclosure;

FIG. 7 is a perspective view of an adjustment joint in the form of afracturing head having inlet and outlet ports that are not axiallyaligned with each other in accordance with an embodiment of the presentdisclosure;

FIG. 8 is a partial cross-section of a fracturing head including a testport to enable integrity testing between two seals of the fracturinghead in accordance with an embodiment of the present disclosure; and

FIG. 9 is a cross-section of an adjustment joint in the form of a pipeconnector having a length that may be varied in accordance with anembodiment of the present disclosure.

DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS

One or more specific embodiments of the present disclosure will bedescribed below. In an effort to provide a concise description of theseembodiments, all features of an actual implementation may not bedescribed in the specification. It should be appreciated that in thedevelopment of any such actual implementation, as in any engineering ordesign project, numerous implementation-specific decisions must be madeto achieve the developers' specific goals, such as compliance withsystem-related and business-related constraints, which may vary from oneimplementation to another. Moreover, it should be appreciated that sucha development effort might be complex and time consuming, but wouldnevertheless be a routine undertaking of design, fabrication, andmanufacture for those of ordinary skill having the benefit of thisdisclosure.

When introducing elements of various embodiments, the articles “a,”“an,” “the,” and “said” are intended to mean that there are one or moreof the elements. The terms “comprising,” “including,” and “having” areintended to be inclusive and mean that there may be additional elementsother than the listed elements. Moreover, any use of “top,” “bottom,”“above,” “below,” other directional terms, and variations of these termsis made for convenience, but does not require any particular orientationof the components.

Turning now to the present figures, an example of a fracturing system 10is provided in FIGS. 1 and 2 in accordance with one embodiment. Thefracturing system 10 facilitates extraction of natural resources (e.g.,oil or natural gas) from a well 12 via a wellbore 14 and a wellhead 16.Particularly, by injecting a fracturing fluid into the well 12, thefracturing system 10 increases the number or size of fractures in a rockformation or strata to enhance recovery of natural resources present inthe formation. In the presently illustrated embodiment, the well 12 is asurface well accessed by equipment of wellhead 16 installed at surfacelevel (i.e., on ground 18). But it will be appreciated that naturalresources may be extracted from other wells, such as platform or subseawells.

The fracturing system 10 includes various components to control flow ofa fracturing fluid into the well 12. For instance, the depictedfracturing system 10 includes a fracturing tree 20 and a fracturingmanifold 22. The fracturing tree 20 includes at least one valve thatcontrols flow of the fracturing fluid into the wellhead 16 and,subsequently, into the well 12. Similarly, the fracturing manifold 22includes at least one valve that controls flow of the fracturing fluidto the fracturing tree 20 by a conduit or fluid connection 26 (e.g.,pipes).

The fracturing manifold 22 is mounted on at least one skid 24 (e.g., aplatform mounted on rails) to enable movement of the fracturing manifold22 with respect to the ground 18. As depicted in FIG. 2, the fracturingmanifold 22 is connected to provide fracturing fluid to multiplefracturing trees 20 and wellheads 16. But it is noted that thefracturing manifold 22 may instead be coupled to a single fracturingtree 20 in full accordance with the present techniques. In oneembodiment in which the fracturing manifold 22 is coupled to multiplefracturing trees 20, various valves of the fracturing manifold 22 may bemounted on separate skids 24 to enable variation in the spacing betweenthe valves. And in at least some instances, as described in furtherdetail below, such a configuration allows for easier alignment of thefluid connection 26 between the fracturing manifold 22 and thefracturing tree 20.

Fracturing fluid from a supply 28 is provided to the fracturing manifold22. In FIG. 1, a connector 30 receives fracturing fluid from the supply28 through a conduit or fluid connection 32 (e.g., pipes or hoses) andthen transmits the fluid to the fracturing manifold 22 by way of asubterranean conduit or fluid connection 34 (e.g., pipes). In oneembodiment, the fracturing fluid supply 28 is provided by one or moretrucks that deliver the fracturing fluid, connect to the connector 30,and pump the fluid into the fracturing manifold 22 via the connector 30and connections 32 and 34. In another embodiment, the fracturing fluidsupply 28 is in the form of a reservoir from which fluid may be pumpedinto the fracturing manifold 22. But any other suitable sources offracturing fluid and manners for transmitting such fluid to thefracturing manifold may instead be used.

A portion 40 of the fracturing system 10 is illustrated in FIG. 3 inaccordance with one embodiment. In the depicted embodiment, the portion40 includes the fracturing tree 20 and the fracturing manifold 22, aswell as several adjustment joints that enable alignment of theconnection line (i.e., fluid connection 26) between the fracturing tree20 and the fracturing manifold 22. The manifold 22 includes a conduit 42that routes fracturing fluid to valves 44 and 46. These valves 44 and 46are coupled to connecting blocks 48 and 50 of the conduit 42 to receivefracturing fluid from the fluid supply 28 via connections 32 and 24. Thefracturing fluid may then be routed through fluid connection 26 to arespective fracturing tree 20. Although the present embodiment includestwo valves 44 and two valves 46, any other suitable number of valves mayinstead be used to control flow of fracturing fluid to fracturing trees20. Further, while the depicted fluid connection 26 includes a singleflow path or conduit (which may be a fracturing line with a seven-inchbore in one instance) between the fracturing tree 20 and the fracturingmanifold 22, a fracturing system may include a greater number ofconduits between the fracturing manifold and a fracturing tree in otherembodiments.

The fracturing tree 20 is provided in the form of a horizontalfracturing tree in FIG. 3, though other embodiments may include adifferent style of fracturing tree (e.g., a vertical tree). The depictedfracturing tree 20 includes valves 52 to control flow of fracturingfluid through a horizontal portion of the tree 20. The tree 20 alsoincludes a master valve 54 to control flow of fluids (e.g., fracturingfluids or production fluids) to or from the attached wellhead 16 (FIG.1), and a port 56 allowing access to the wellhead 16 through the mastervalve 54. In other embodiments, the valve 54 may be omitted (e.g., in acomposite tree arrangement with all valves integral to one block).

The portion 40 of the fracturing system 10 also includes extendableadjustment joints that facilitate connection of the fracturing manifold22 to the fracturing tree 20. In the presently illustrated embodiment,the adjustment joints are provided in the form of adjustable fracturingheads 60, 62, and 64 (also commonly referred to as “goat heads”), thoughother forms of adjustment joints are also envisaged and may be used inaccordance with the present techniques. In operation, the fracturingtree 20 may be mounted at a fixed location (i.e., coupled to thewellhead 16). The fluid connection 26 is aligned and coupled between thefracturing tree 20 and the fracturing manifold 22. The adjustment joints(e.g., the fracturing heads 60, 62, and 64 in FIG. 3) facilitate suchalignment and coupling of the fluid connection by allowing an operatorto manipulate the position of the fluid connection 26 by changing adimension (e.g., length or height) of the adjustment joint. By providingthree adjustment joints, each with a different axis of movement (i.e.,up-and-down, forward-and-backward, and left-and-right), adjustments canbe made to help facilitate coupling of the fracturing manifold 22 to thefracturing tree 20.

For example, the conduit 42 includes a fracturing head 60 that may beextended or retracted (as represented by arrow 68) to vary the length ofthe conduit 42 and the distance between the valves 44 and 46 (which maybe mounted on separate skids 24, as discussed above, to allow relativemotion between the valves 44 and 46). Such variation also provides afirst degree of freedom in aligning the fluid connection 26 between thefracturing tree 20 and the fracturing manifold 22. In other words, theadjustment joint in conduit 42 allows the distance between the sealpoints of the fluid connection 26 at the fracturing tree 20 and at thefracturing manifold 22 to be varied in a first dimension.

Likewise, the fluid connection 26 in FIG. 3 includes the fracturing head62 to vary the length of the fluid connection 26 in a second dimension,as represented by arrow 70. The adjustability of the fracturing head 62provides a second degree of freedom in aligning the connection betweenthe fracturing tree 20 and the fracturing manifold 22. Further, theportion 40 includes the fracturing head 64 having a variable length in athird dimension (as represented by arrow 72), thus providing a thirddegree of freedom in aligning the fluid connection 26 between thefracturing tree 20 and the fracturing manifold 22. These three degreesof freedom are provided by three adjustment joints having differentdirections of adjustment that are not parallel, and in some embodiments(such as in FIG. 3) the directions of adjustment are orthogonal to oneanother. In addition to these three translational degrees of freedom,one or more of the adjustment joints (e.g., fracturing heads 60, 62, and64) may also be rotated about their axes, as indicated by arrows 69, 71,and 73, to provide rotational degrees of freedom. For example, thepresently depicted embodiment provides six degrees of freedom (threetranslational and three rotational).

While large fracturing lines (e.g., with a seven-inch bore) aretraditionally difficult to adjust between a fracturing manifold and afracturing tree, the adjustability provided in the presently disclosedsystem 10 enables large fracturing lines to be aligned and connected tosuch components more efficiently. Consequently, as depicted in FIG. 3, asingle fluid connection 26 may be provided in the form of a large-borefracturing line, rather than using multiple smaller-bore fracturinglines between the fracturing manifold and a given fracturing tree.

While the presently depicted embodiment includes three adjustmentjoints, it is noted that other embodiments may include fewer adjustmentjoints providing fewer degrees of freedom in aligning the fluidconnection 26. For instance, a single adjustment joint may be providedto give one translational degree of freedom (e.g., up-and-down,forward-and-backward, or left-and-right) in aligning the fracturing tree20 and the fracturing manifold 22 for the fluid connection 26. Or twoadjustment joints may be provided to give two translational degrees offreedom. Such adjustment joints may also provide rotational degrees offreedom as noted above. Further still, multiple adjustment joints may bealigned coaxially to provide adjustability at different locations withinthe system 10 (e.g., the manifold 22 may include multiple, coaxialadjustment joints).

For clarity, only a single fluid connection 26 and a single fracturingtree 20 (both of which receive fracturing fluid from the valves 44) aredepicted in FIG. 3 as part of portion 40 of the fracturing system 10.But it will be appreciated that the fracturing system 10 may includeadditional fluid connections 26 and fracturing trees 20 (see, e.g., FIG.2). For example, valves 46 may be coupled (e.g., via outlet 74) toanother fluid connection 26 leading to a different fracturing tree 20 onanother wellhead 16. Further, the conduit 42 may extend beyond thedepicted connection blocks 48 and 50 to route fracturing fluid toadditional valves and associated fracturing trees 20. And the conduit 42may include additional adjustment joints to enable movement of suchadditional valves relative to another portion of the manifold 22,thereby facilitating alignment of these valves with their associatedfracturing trees 20.

The fracturing head 60, in accordance with one embodiment, isillustrated in greater detail in FIGS. 4-6. In the depicted embodiment,the fracturing head 60 includes a body having a first portion 82 and asecond portion 84. The body portions 82 and 84 are configured to movewith respect to one another to vary a dimension of the fracturing headand facilitate connection of the fracturing manifold 22 and thefracturing tree 20 as described above. The fracturing head 60 includesfluid ports 86 and 114 (FIG. 5) to transmit fluid through the fracturinghead 60. In some embodiments, such as when installed in the fracturingsystem 10 in the manner depicted in FIG. 3, the fluid port 86 may beconsidered an output port and the fluid port 114 may be considered aninlet port. In addition to the fluid port 86, the second body portion 84includes a set of studs 88 and nuts 90 for connecting the fracturinghead 60 to another component (e.g., via an API flange or otherconnector). Similarly, the first body portion 82 includes through holes92 arranged in a flange 93 about the fluid port 114 for coupling toanother component (e.g., also coupled to an API flange via additionalstuds and nuts or to another connector). The first body portion 82includes an additional set of through holes 95 positioned radiallyoutward from the through holes 92. The through holes 95 are aligned withmating holes 97 in a flange 99 of the second body portion 84, and thefirst and second body portions 82 and 84 are secured to one another withstuds 94 (through the holes 95 and 97) and nuts 96.

As depicted in FIGS. 5 and 6, a bore 98 extends through the fracturinghead 60 between the fluid ports 86 and 114. The bore 98 may have adiameter similar or identical to that of the components coupled to thefluid ports 86 and 114, such as seven inches in one embodiment (thoughother diameters may be used for the bore 98, as well as for othercomponents). The bore may also be sized to match the inner diameter ofthe production casing in the well (i.e., a full bore arrangement) tofacilitate the passage of tools, plugs, or the like through thefracturing head 60. The fracturing head 60 includes an adjustment collar100 that may be rotated on threads 104 by a user to translate the collar100 with respect to the body portion 82 or 84 of the fracturing head 60on which the collar is threaded (i.e., first body portion 82 in FIGS. 5and 6). Movement of the adjustment collar 100 allows adjustment of thelength of the fracturing head 60 and the distance between fluid ports 86and 114. Particularly, as illustrated in FIG. 6, nuts 96 may be loosenedon the studs 94 and the adjustable collar 100 may be moved along thefirst body portion 82 to lengthen the fracturing head 60. In thismanner, the length (or what may instead be considered the height) of thefracturing head 60 may be varied to aid in aligning and coupling thefracturing manifold 22 and the fracturing tree 20 via the fluidconnection 26, as discussed above. The fracturing head 60, as well asother adjustment joints in the system 10 (e.g., the fracturing heads 62and 64 or the pipe connector 130 of FIG. 9), may be constructed to allowfor any desired amount of variation in dimension. For instance, theadjustment joints may be constructed to allow dimensional variation(e.g., lengthening) of seven inches in one embodiment, of twelve inchesin another embodiment, and of eighteen inches in still anotherembodiment.

The fracturing head 60 also includes various sealing elements to inhibitfluid leakage. For instance, as depicted, fracturing head 60 includessealing elements 102, 106, 108, 110, and 112. The sealing elements areformed of any suitable material, such as an elastomer or metal. In oneembodiment, the seals 106 and 108 include CANH™ seals available fromCameron International Corporation of Houston, Tex. Also, in oneembodiment movement of the collar 100 pre-loads or energizes one or moreof the seals of the fracturing head 60.

As depicted in FIG. 7, the fracturing head 64 is generally similar tothe fracturing head 60 (and the fracturing head 62, which is identicalto the fracturing head 60 in one embodiment) but includes a fluid port86 on a side face of the body portion 84 rather than on the top face. Asillustrated in FIG. 3, such an arrangement enables the fracturing head64 to connect a pipe of fluid connection 26 with the fracturing tree 20via a bore bent at an angle (e.g., at a right angle) to change thedirection of fluid flowing through the fracturing head 64. And adimension of the fracturing head 64 may be varied in the same manner asdescribed above with respect to fracturing head 60, thereby facilitatingalignment and coupling of the fracturing tree 20 and the fracturingmanifold 22 with the fluid connection 26.

In one embodiment illustrated in FIG. 8, a fracturing head (e.g.,fracturing head 60, 62, or 64) includes seals 118 and 120 (rather thanseals 106, 108, and 110) disposed in an annular space 122. The seals 118and 120 are formed of any suitable material, and may include metal CANH™seals in one embodiment. The annular space 122 is bound by the bodyportion 82, the body portion 84, and the adjustable collar 100. A testport 124 extends from the annular space 122 (e.g., at a location betweenthe seals 118 and 120) to an exterior surface of the body portion 84 toallow connection of a pressure monitoring device to enable monitoring ortesting of the integrity of the seals 118 and 120.

While the adjustment joints of the fracturing system 10 have beendescribed above in the form as fracturing heads, other embodiments mayuse other adjustment joints in addition to, or in place of thefracturing heads. For example, one or more of the fracturing heads 60,62, and 64 of FIG. 3 may be replaced by other adjustment joints inadditional embodiments. One example of another adjustment joint isdepicted in FIG. 9 in the form of a pipe connector 130. The connector130 includes a first tubular member 132 and a second tubular member 134.The tubular members 132 and 134 may be pipes (e.g., of the fluidconnection 26 or conduit 42), or they may be coupled to pipes or otherconduits in any suitable fashion. The opposite ends of the connectorinclude an inlet and an outlet, allowing fracturing fluid to flowthrough the connector 130 via the bores of either the members 132 and134 themselves or of the pipes or other conduits joined by the connector130.

The connector 130 is configured to enable relative movement between thetubular members 132 and 134 to allow variation in the length of theconnector 130. Like the fracturing heads 60, 62, and 64, the connector130 may be constructed to allow any desired range of variation inlength, such as a range of seven inches or twelve inches. Various seals136, 138, and 140 are provided between the tubular members 132 and 134.In one embodiment, the seal 136 is an elastomeric seal and the seals 138and 140 are metal CANH™ seals.

The connector 130 also includes a collar 142 (which may also be referredto herein as union nut 142) that cooperates with a flanged collar 154 toadjust the length of the connector 130. The union nut 142 may be coupledto the first tubular member 132 in any suitable manner. In the depictedembodiment, threads 146 allow the union nut 142 to be threaded onto thetubular member 132. The union nut 142 includes an end 150 that engagesthe collar 154 via threads 152, and rotation of the union nut 142 causesthe collar 154 to move along the axis of the connector 130 with respectto the tubular member 132. A flange 156 of the collar 154 is coupled toa mating flange 158 of the tubular member 134 by studs 160 and nuts 162.Consequently, rotation of the union nut 142 also causes the secondtubular member 134 to be moved with respect to the first tubular member132, thereby enabling the connector 130 to be lengthened or shortenedthrough such operation. The connector 130 may also include a test port164 to enable monitoring of the integrity of seals 138 and 140 in amanner similar to that described above with respect to test port 124(FIG. 8).

While the aspects of the present disclosure may be susceptible tovarious modifications and alternative forms, specific embodiments havebeen shown by way of example in the drawings and have been described indetail herein. But it should be understood that the invention is notintended to be limited to the particular forms disclosed. Rather, theinvention is to cover all modifications, equivalents, and alternativesfalling within the spirit and scope of the invention as defined by thefollowing appended claims.

The invention claimed is:
 1. A system comprising: a fracturing manifold;and a fracturing tree coupled to the fracturing manifold, the fracturingtree including a fracturing head to receive a fracturing fluid from thefracturing manifold and to transmit the fracturing fluid to anotherportion of the fracturing tree, the fracturing head comprising: a bodyhaving an inlet port, an outlet port, and a bore to enable thefracturing fluid to flow between the inlet port and the outlet port,wherein the body is an adjustable body that permits movement of a firstportion of the body having the inlet port with respect to a secondportion of the body having the outlet port to enable variation in adimension of the adjustable body so as to change the distance betweenthe inlet port and the outlet port and to facilitate connection of thefracturing manifold to the fracturing tree; the first and secondportions of the body each include a body member having an interiorsurface that defines a portion of the bore; and the fracturing head isinstalled such that, during flow of the fracturing fluid between theinlet port and the outlet port, the fracturing fluid flows along and incontact with the interior surface of the body member of the secondportion.
 2. The system of claim 1, comprising at least one additionalfracturing head with an adjustable body that enables variation in adimension of the additional fracturing head to facilitate connection ofthe fracturing manifold to the fracturing tree.
 3. The system of claim2, wherein the variable dimension of the adjustable body of thefracturing head is not parallel to the variable dimension of theadditional fracturing head.
 4. The system of claim 3, wherein thevariable dimension of the adjustable body of the fracturing head isorthogonal to the variable dimension of the additional fracturing head.5. The system of claim 2, wherein the at least one additional fracturinghead includes two additional fracturing heads with adjustable bodies,and the fracturing head and the two additional fracturing heads providethree translational degrees of freedom in aligning and connecting thefracturing manifold to the fracturing tree.
 6. The system of claim 5,wherein the fracturing head and the two additional fracturing heads alsoprovide three rotational degrees of freedom in aligning and connectingthe fracturing manifold to the fracturing tree.
 7. The system of claim1, wherein the fracturing head is a single-bore fracturing head with asingle inlet port and a single outlet port.
 8. The system of claim 1,comprising a single flow path between the fracturing manifold and thefracturing tree.
 9. The system of claim 1, wherein the fracturingmanifold is mounted on a skid to enable movement of the fracturingmanifold with respect to a wellhead.
 10. The system of claim 1, whereinthe fracturing tree is coupled to a wellhead.
 11. The system of claim 1,comprising a plurality of fracturing trees coupled to the fracturingmanifold.
 12. The system of claim 1, wherein the fracturing treeincludes a horizontal fracturing tree.
 13. The system of claim 1,comprising the fracturing fluid.
 14. A fracturing head comprising: afracturing head body having an inlet port, an outlet port, and a bore toenable a fracturing fluid to flow between the inlet port and the outletport, wherein the fracturing head body is an adjustable fracturing headbody that permits movement of a first portion of the fracturing headbody having the inlet port with respect to a second portion of thefracturing head body having the outlet port to enable variation in adimension of the adjustable fracturing head body so as to change thedistance between the inlet port and the outlet port, one of the first orsecond portions of the fracturing head body is received within the otherof the first or second portions of the fracturing head body; and atleast one seal that is positioned in an annular space between the firstand second portions of the fracturing head body radially outward of thebore to seal between the first and second portions of the fracturinghead body.
 15. The fracturing head of claim 14, comprising an adjustmentcollar threaded onto the first portion or the second portion.
 16. Thefracturing head of claim 15, wherein the adjustment collar is positionedwithin the annular space between the first and second portions of thefracturing head body and allows an operator to rotate the adjustmentcollar so as to vary the length of the adjustable fracturing head bodybetween the inlet port and the outlet port and so as to energize the atleast one seal that is positioned in the annular space between the firstportion and the second portion.
 17. The fracturing head of claim 14,wherein the first portion of the fracturing head includes a flangecomprising: a first plurality of through holes aligned with matingthrough holes in a flange of the second portion of the fracturing head;and a second plurality of through holes radially inward from the firstplurality of through holes, wherein the second plurality of throughholes enables the first portion of the fracturing head to be coupled tothe fracturing manifold via a connecting flange.
 18. The fracturing headof claim 14, wherein the bore of the fracturing head includes a bend tochange direction of flow of the fracturing fluid through the fracturinghead.
 19. The fracturing head of claim 14, wherein the inlet port andthe outlet port are aligned with one another along an axis of thefracturing head body and the adjustable fracturing head body enablesvariation in the dimension along the axis.
 20. The fracturing head ofclaim 14, wherein the at least one seal includes a first seal and asecond seal disposed in the annular space between the first portion andthe second portion, and the fracturing head includes a test port thatextends from an exterior surface of the fracturing head to the annularspace at a position between the first seal and the second seal.
 21. Amethod comprising: providing a fracturing head having an inlet port andan outlet port; installing the fracturing head in a fracturing system,wherein installing the fracturing head includes adjusting the height ofthe fracturing head to vary the distance between the inlet port and theoutlet port of the fracturing head, adjusting the height of thefracturing head to vary the distance between the inlet port and theoutlet port of the fracturing head includes moving a first portion ofthe fracturing head having the inlet port with respect to a secondportion of the fracturing head having the outlet port, and the first andsecond portions of the fracturing head each include a body member havingan interior surface that defines a portion of a bore extending throughthe fracturing head from the inlet port to the outlet port; and routingfracturing fluid from the inlet port to the outlet port through the boresuch that the fracturing fluid flows along and in contact with theinterior surface of the body member of the second portion.
 22. Themethod of claim 21, comprising testing integrity of one or more seals ofthe fracturing head via a test port in the fracturing head.